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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Effects of growth parameters and deposition zone geometry on boron carbide whiskers produced in graphite resistance furnace - filament synthesis
Low density cesium seeded argon plasma source with graphite element heat exchanger
Rocket-nozzle environment simulation with DC arc- plasma generator noting graphite and phenolic material test results
Q-spoiled ruby laser beam focused on graphite, obtaining Swan emission of carbon molecule
A study has been made of a flare-cylinder configuration to investigate its feasibility as a reentry body of an intermediate range ballistic missile. Factors considered were heating, weight, stability, and impact velocity. A series of trajectories covering the possible range of weight-drag ratios were computed for simple truncated nose shapes of varying pointedness, and hence varying weight-drag ratios. Four trajectories were chosen for detailed temperature computation from among those trajectories estimated to be possible. Temperature calculations were made for both "conventional" (for example, copper, Inconel, and stainless steel) and "unconventional" (for example, beryllium and graphite) materials. Results of the computations showed that an impact Mach number of 0.5 was readily obtainable for a body constructed from conventional materials. A substantial increase in subsonic impact velocity above a Mach number of 0.5 was possible without exceeding material temperature limits. A weight saving of up to 134 pounds out of 822 was possible with unconventional materials. This saving represents 78 percent of the structural weight. Supersonic impact would require construction of the body from unconventional materials but appeared to be well within the range of attainability.
Electrochemical cells with solid state components employ charge transfer complexes or donor-acceptor complexes in which the donor component is an organic compound and the acceptor component is a halogen. A minor proportion of graphite added to these composition helps reduce the resistivity.
Research in materials science - high temperature structural materials, wetting and adherence of nickel alloys to sapphire, boron carbide filaments, and ceramic and graphite fibers
Thermochemical interaction between ablation material and environment during manned reentry, using mainly graphite and composite materials
Graphite, molybdenum and tungsten sulfides and calcium fluoride effective as solid lubricants in extreme environments
Radial furnace, with a long graphite vaporization tube, maintains a uniform thermal gradient, favoring the growth of straight boron carbide whiskers. This concept seems to offer potential for both the quality and yield of whiskers.
Thermocouple tubing of thoriated tungsten with a very fine grain structure produces a small-diameter sheath capable of operating up to 5000 degrees R in a hydrogen and graphite environment. This tubing remains ductile and resists both grain growth and carbiding even after prolonged exposure to temperature.
Carbon phenolic, graphite phenolic, and silica phenolic nozzle ablative materials performance for large solid propellant rocket boosters
Growth characteristics and properties of boron carbide whiskers obtained by vapor deposition method, or in graphite resistance furnace
Analysis of impurities in magnesium oxide materials by mass spectrographic, chemical, thermogravimetric, vacuum-fusion furnace, quartz tube graphite crucible furnace techniques
Temperature control and thermal coupling of cesium adsorption porous tungsten, charcoal and graphite reservoirs
Interstellar polarization with graphite grains covered with dirty ice mantles matched with entire range of observed interstellar extinction
Visible and near IR spectral reflectance and emittance at high temperature of ablation chars, carbon and graphite
Creep deformation mechanism of pyrolytic graphite at high temperatures in response to stress